JP6187708B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine in which a coil end of a field winding is pressed by a magnetic pole head.

  Conventionally, a rotating electrical machine having a salient pole rotor structure has been provided as one of the rotating electrical machines. In such a salient pole rotor structure, a plurality of projecting portions projecting radially outward are arranged along the circumferential direction on the outer peripheral portion of the magnetic core that forms the central portion of the rotor. The field winding is wound around the protrusion.

  At this time, a magnetic pole head is provided on the top surface of the protrusion, and the field winding wound around the protrusion is pressed by the magnetic pole head. This prevents the field winding from deviating from the protrusion due to the centrifugal force caused by the rotation of the rotor.

  For example, Patent Documents 1 and 2 disclose conventional rotating electrical machines as described above.

JP-A-6-351203 JP-A-7-75267

  Here, if the wound field winding is pressed down to the coil end by the magnetic pole head as in the conventional rotating electric machine, the axial length of the magnetic pole head becomes relatively long. The axial length of the magnetic pole head is longer than the axial length of the stator core that faces the magnetic pole head in the radial direction. That is, both axial end portions of the magnetic pole head are positioned on the outer side in the axial direction than both axial end surfaces of the stator core.

  In addition, when an exciting current is passed through the field winding, a magnetic flux is generated inside the field winding, and this magnetic flux passes through the protrusion and the magnetic pole head to reach the inner peripheral surface of the stator core. Will head. At this time, as described above, when both axial end portions of the magnetic pole head are positioned axially outside of both axial end surfaces of the stator core, both axial end portions of the magnetic pole head are fixed to the stator. Since it does not oppose the inner peripheral surface of the iron core in the radial direction, the magnetic flux that has passed through both end portions in the axial direction is directed to portions other than the inner peripheral surface of the stator core.

  Such a magnetic flux directed to a portion other than the inner peripheral surface of the stator core is called a leakage magnetic flux, and, for example, toward both end surfaces of the stator core in the axial direction and surrounding structures of the stator core. It will flow. And if leakage magnetic flux increases, since an eddy current loss will increase, there exists a possibility of reducing the electrical property of a rotary electric machine.

  Accordingly, an object of the present invention is to provide a rotating electrical machine that can improve electrical characteristics by reducing leakage flux and increasing effective magnetic flux.

The rotating electrical machine according to the first invention for solving the above-described problems is
A cylindrical stator core,
A plurality of protrusions that are rotatably supported on the inner side in the radial direction of the stator core and protrude toward the outer side in the radial direction are arranged along the circumferential direction;
A field winding wound around the side surface of the protrusion;
A magnetic pole head that is provided on the top surface of the projecting portion and contacts the outer end surface in the winding direction of the field winding to hold down the field winding;
Provided with both ends of the magnetic pole head in the axial direction together with the magnetic head of the magnetic pole, and a pressing portion for pressing the coil end in contact with the outer end surface in the winding axis direction at the coil end of the field winding. ,
The pressing portion is
Arranged on the outer side in the axial direction from both axial end surfaces of the stator core,
An inclined surface that is disposed radially inward of a radially outer end face that faces the inner peripheral surface of the stator core in the magnetic pole head in the radial direction and gradually inclines radially inward toward the axially outer side. ,
It has a level | step difference which connects the axial direction outer side edge part of the said radial direction outer side end surface, and the axial direction inner side edge part of the said inclined surface in radial direction.

A rotating electrical machine according to a second invention for solving the above-described problems is
A cylindrical stator core,
A plurality of protrusions that are rotatably supported on the inner side in the radial direction of the stator core and protrude toward the outer side in the radial direction are arranged along the circumferential direction;
A field winding wound around the side surface of the protrusion;
A magnetic pole head that is provided on the top surface of the projecting portion and contacts the outer end surface in the winding direction of the field winding to hold down the field winding;
Provided with both ends of the magnetic pole head in the axial direction together with the magnetic head of the magnetic pole, and a pressing portion for pressing the coil end in contact with the outer end surface in the winding axis direction at the coil end of the field winding. ,
The pressing portion is
Arranged axially inside from both axial end surfaces of the stator core,
An inclined surface that is disposed radially inward of a radially outer end face that faces the inner peripheral surface of the stator core in the magnetic pole head in the radial direction and gradually inclines radially inward toward the axially outer side. ,
It has a level | step difference which connects the axial direction outer side edge part of the said radial direction outer side end surface, and the axial direction inner side edge part of the said inclined surface in radial direction.

A rotating electrical machine according to a third invention for solving the above-described problem is
The protrusion and the magnetic pole head are separate members.

A rotating electrical machine according to a fourth invention for solving the above-described problem is
The step is formed in the entire width direction of the pressing portion.

  Therefore, according to the rotating electrical machine according to the present invention, the pressing portions provided at both axial end portions of the magnetic pole head are arranged on the axially outer side or the axially inner side with respect to the axial end surfaces of the stator core. By forming an inclined surface and a step in the part, the radial distance between the inclined surface of the pressing part and the inner peripheral surface of the stator core can be increased, so that the magnetic resistance between them can be increased. can do. As a result, the leakage magnetic flux passing through the inclined surface of the pressing portion can be reduced, while the effective magnetic flux passing through the radially outer end surface of the magnetic pole head and toward the inner peripheral surface of the stator core can be increased. , Electrical characteristics can be improved.

It is the front view which looked at the rotary electric machine which concerns on this invention from the axial direction. It is AA arrow sectional drawing of FIG. 1, Comprising: It is the figure which showed the mode of the leakage magnetic flux when the pressing part of a magnetic pole head is arrange | positioned in an axial direction outer side from the axial direction end surface of a stator core. It is AA arrow sectional drawing of FIG. 1, Comprising: It is the figure which showed the mode of the leakage magnetic flux generation | occurrence | production when the pressing part of a magnetic pole head is arrange | positioned axially inside rather than the axial direction end surface of a stator core. It is sectional drawing which showed the mode of the leakage magnetic flux generation when forming an inclined surface without providing a level | step difference in the holding | suppressing part of a magnetic pole head. (A) is a front view of the press part in which the horizontal surface was formed, (b) is BB arrow sectional drawing of the figure (a). (A) is a front view of the holding | suppressing part in which the horizontal surface and the convex surface were formed, (b) is CC sectional view taken on the line of the figure (a). (A) The front view of the holding | suppressing part in which the inclined surface was formed, (b) is DD sectional view taken on the line of the figure (a).

  Hereinafter, a rotating electrical machine according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the salient pole-type rotating electrical machine 1 supports a salient pole-type rotor 12 rotatably on the radially inner side of a cylindrical stator core 11. At this time, the stator core 11 is formed by punching magnetic steel plates (for example, electromagnetic steel plates) and stacking them in the axial direction so as to be integrated. On the other hand, the salient pole rotor 12 includes a rotating shaft 21, a magnetic pole core 22, a magnetic pole head 23, a field winding (coil) 24, and the like.

  That is, the salient pole rotor 12 rotates about the rotation shaft 21 as a rotation center, and the rotation shaft 21 is fitted in the center hole of the magnetic pole core 22.

  Moreover, the magnetic pole core 22 is processed from a lump-shaped magnetic material that is not laminated so that the cross section has a substantially cross shape. Thereby, a plurality of (four) protrusions 22 a protrude outward in the radial direction on the outer peripheral portion of the magnetic core 22 and are arranged at equal angular intervals in the circumferential direction. These protrusions 22 a extend in the axial direction over the entire axial direction of the magnetic pole core 22, and the axial length of the protrusion 22 a is the same as the axial length of the stator core 11. It has become.

  Further, a field winding 24 is wound around the side peripheral surface of the protrusion 22a. That is, the coil ends 24 b of the field windings 24 wound around the protrusions 22 a are disposed on the outer side in the axial direction than the both axial end surfaces 11 a of the stator core 11.

  On the other hand, the magnetic pole head 23 is fixed to the radially outer end face (top face) of the protrusion 22a by a plurality of bolts (not shown). The magnetic pole head 23 has a substantially trapezoidal cross section and vertical section, and a radially outer end face (top face) 23 a faces the inner peripheral face 11 b of the stator core 11 in the radial direction. At this time, the axial length of the magnetic pole head 23 is longer than the axial length of the stator core 11.

  And the side peripheral part of the magnetic pole head 23 has protruded outward rather than the side peripheral surface of the protrusion 22a, and the overhang | projection part is radial direction in the winding direction outer end surface 24a of the field winding 24 It is in contact with this so as to cover from the outside.

  In other words, the magnetic pole head 23 presses the field winding 24 wound around the protrusion 22a from the radially outer side toward the radially inner side. Thereby, it is possible to prevent the field winding 24 from deviating radially outward from the protrusion 22a due to the centrifugal force caused by the rotation of the salient pole rotor 12.

  Here, the projecting portions which are both ends in the axial direction of the magnetic pole head 23 are the pressing portions 31 for pressing only the entire region of the outer end surface 24a in the winding direction in the coil end 24b of the field winding 24 wound around the protrusion 22a. Is forming. The pressing portion 31 is disposed on the outer side in the axial direction with respect to the both axial end surfaces 11 a of the stator core 11, and is formed in the entire width direction of the magnetic pole head 23.

  Further, the radially outer end surface of the pressing portion 31 forms an inclined surface 31a. The inclined surface 31a is gradually inclined inward in the radial direction from the inner side in the axial direction toward the outer side in the axial direction, and does not face the inner peripheral surface 11b of the stator core 11 in the radial direction.

  Furthermore, the holding | suppressing part 31 is formed in the radial inside rather than the radial direction outer end surface 23a. That is, the axially inner end portion of the inclined surface 31a and the axially outer end portion of the radially outer end surface 23a are connected by the step 31b, and the step direction of the step 31b is the same as the radial direction. .

  And the inclined surface 31a and the level | step difference 31b are formed by shaving the radial direction outer side part of the holding | suppressing part 31, Comprising: It forms in the width direction whole region of the said holding | suppressing part 31 (magnetic pole head 23). . As will be described in detail later by forming the inclined surface 31a and the step 31b in the pressing portion 31 as described above, it is possible not only to reduce the leakage magnetic flux and increase the effective magnetic flux, but also to reduce the weight of the pressing portion 31. Can also be achieved. As a result, even if a centrifugal force due to the rotation of the salient pole rotor 12 acts on the magnetic pole head 23, the bolt for fixing the magnetic pole head 23 is equivalent to the weight reduction of the pressing portion 31. It is possible to reduce the stress burden on the.

  Furthermore, since the inclination angle of the inclined surface 31a can be reduced by providing the step 31b, the inclined surface 31a can be moved away from the inner peripheral surface 11b of the stator core 11 inward in the radial direction. That is, the radial distance D between the inclined surface 31a and the inner peripheral surface 11b can be increased. In addition, the inclination angle of the inclined surface 31a is an inclination angle with respect to the axial direction. Specifically, the winding direction outer end surface 24a of the field winding 24 (coil end 24b) and the radial direction of the protrusion 22a. It is an inclination angle with respect to the outer end face (top face).

  From the above, as shown in FIG. 1, the magnetic pole 25 is formed by the protrusion 22a, the magnetic pole head 23, and the field winding 24 of the magnetic core 26, and the field wound in a cylindrical shape. By passing an exciting current through the winding 24, a magnetic field can be generated inside the field winding 24. Then, by utilizing the repulsive force and attractive force between the magnetic field (rotating magnetic field) generated on the stator (stator core 11) side and the magnetic field generated on the salient pole rotor 12 side, The polar rotor 12 can be rotated with respect to the stator core 11.

  At this time, as shown in FIG. 2, the magnetic flux Φ in the magnetic field generated by the field winding 24 is directed from the protrusion 22a to the inner peripheral surface 11b of the stator core 11 through the magnetic pole head 23. Is flowing. That is, the magnetic flux Φ forming the magnetic field passes through the field winding 24 toward the radially outer side.

  Here, as shown in FIG. 4, for example, the flow of the magnetic flux Φ when the pressing portion 31 does not include the step 31 b will be described. That is, the radially outer end surface of the pressing portion 31 forms an inclined surface 31c. The inclined surface 31c is gradually inclined inward in the radial direction from the inner side in the axial direction toward the outer side in the axial direction, and is not opposed to the inner peripheral surface 11b of the stator core 11 in the radial direction. It is directly connected without passing through the direction outer end face 23a and the step 31b.

  Therefore, the radial distance Do between the inclined surface 31c and the inner peripheral surface 11b is the same distance as the radial distance between the radially outer end surface 23a and the inner peripheral surface 11b. The magnetic resistance between the surface 11b is substantially the same as the magnetic resistance between the radially outer end surface 23a and the inner peripheral surface 11b. Thereby, among the magnetic fluxes Φ generated by the field winding 24, in particular, the magnetic flux Φ that passes the outermost axial direction (most pressing portion 31 side) passes through the radially outer end face 23a as the leakage magnetic flux Φ. Without passing through the inclined surface 31c.

  As described above, the leakage flux Φ that has passed through the pressing portion 31 (inclined surface 31c) that is not opposed to the inner peripheral surface 11b of the stator core 11 in the radial direction is branched into, for example, leakage flux ΔΦ1 to ΔΦ3 and fixed. It flows toward the axial end surface 11 a of the core 10 or flows toward other members other than the stator core 11. As a result, eddy currents centered on the leakage fluxes ΔΦ1 to ΔΦ3 are generated. In particular, in the stator core 11, the eddy current loss in the axial end surface 11a increases. There is a risk of deteriorating electrical characteristics.

  On the other hand, as shown in FIG. 2, when the inclined surface 31a is formed in the pressing portion 31 using the step 31b, the inclination angle of the inclined surface 31a can be reduced. It can be kept away from the inner peripheral surface 11b of the iron core 11 toward the radially inner side. That is, since the radial distance D between the inclined surface 31a and the inner peripheral surface 11b can be made longer than the radial distance between the radially outer end surface 23a and the inner peripheral surface 11b, The magnetic resistance between the inner peripheral surface 11b can be made larger than the magnetic resistance between the radially outer end surface 23a and the inner peripheral surface 11b.

  As a result, the leakage flux Φ that has passed through the pressing portion 31 (inclined surface 31a) that is not opposed to the inner peripheral surface 11b of the stator core 11 in the radial direction is, for example, only the leakage flux ΔΦ2, ΔΦ3, and the leakage flux ΔΦ1 The flow to the axial end surface 11a can be suppressed.

  Therefore, the eddy current loss in the axial end surface 11a of the stator core 11 can be reduced. That is, the effective magnetic flux Φ (ΔΦ1) passing through the radially outer end surface 23a of the magnetic pole head 23 and reaching the inner peripheral surface 11b of the stator core 11 can be increased. Can be improved.

  In the above-described embodiment, the inclined surface 31a of the pressing portion 31 is disposed on the outer side in the axial direction from the axial end surface 11a of the stator core 11. However, the inclined surface 31a is more than the axial end surface 11a. May also be arranged on the inner side in the axial direction so as to face the inner peripheral surface 11b in the radial direction.

  Specifically, as shown in FIG. 3, the magnetic pole core 22 is processed so that the axial length of the protrusion 22 a is shorter than the axial length of the stator core 11. Then, the field winding 24 is wound around the side peripheral surface of the protrusion 22 a and the coil end 24 b of the field winding 24 is pressed by the pressing portion 31. Thereby, the inclined surface 31a and the step 31b are disposed on the inner side in the axial direction than the axial end surface 11a of the stator core 11, and are opposed to the inner peripheral surface 11b of the stator core 11 in the radial direction.

  By adopting such a configuration, the leakage flux ΔΦ4 that is a part of the leakage flux ΔΦ2, ΔΦ3 that has passed through the inclined surface 31a can be made to reach the inner peripheral surface 11b of the stator core 11 as an effective magnetic flux Φ. . Therefore, since the effective magnetic flux Φ (ΔΦ1, ΔΦ4) can be increased, the electrical characteristics of the rotating electrical machine 1 can be improved.

  In the above-described embodiment, the inclined surface 31a and the step 31b are formed in the pressing portion 31. Of these, the step 31b for extending the radial distance from the inner peripheral surface 11b is provided. The surface adjacent to the outside in the axial direction of the step 31b may be a surface having a different form from the inclined surface 31a.

  For example, as shown in FIGS. 5A and 5B, a horizontal surface 31 d may be formed adjacent to the step 31 b in the pressing portion 31. The horizontal surface 31 d is a surface orthogonal to the radial direction, and extends in the width direction of the pressing portion 31.

  Further, as shown in FIGS. 6A and 6B, a horizontal surface 31 d and a convex surface 31 e may be formed adjacent to the step 31 b in the pressing portion 31. The convex surface 31e is a surface orthogonal to the radial direction, and is disposed on the outer side in the radial direction than the horizontal surface 31d and in the center in the width direction of the horizontal surface 31d.

  Further, as shown in FIGS. 7A and 7B, two inclined surfaces 31 f may be formed adjacent to the step 31 b in the pressing portion 31. The inclined surfaces 31f are gradually inclined inward in the radial direction from the inner side in the width direction toward the outer side in the width direction, and are adjacent in the width direction. Thereby, the two inclined surfaces 31f form a triangular shape as a whole.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 11 Stator iron core, 11a Axial end surface, 11b Inner peripheral surface, 12 Salient pole type rotor, 21 Rotating shaft, 22 Magnetic pole core, 22a Protruding part, 23 Magnetic pole head, 23a Radial outer end surface, 24 Field winding, 24a Winding direction outer end surface, 24b Coil end, 25 Magnetic pole, 31 Holding part, 31a Inclined surface, 31b Step, 31c Inclined surface, 31d Horizontal surface, 32e Convex surface, 32f Inclined surface

Claims (4)

A cylindrical stator core,
A plurality of protrusions that are rotatably supported on the inner side in the radial direction of the stator core and protrude toward the outer side in the radial direction are arranged along the circumferential direction;
A field winding wound around the side surface of the protrusion;
A magnetic pole head that is provided on the top surface of the projecting portion and contacts the outer end surface in the winding direction of the field winding to hold down the field winding;
Provided with both ends of the magnetic pole head in the axial direction together with the magnetic head of the magnetic pole, and a pressing portion for pressing the coil end in contact with the outer end surface in the winding axis direction at the coil end of the field winding. ,
The pressing portion is
Arranged on the outer side in the axial direction from both axial end surfaces of the stator core,
An inclined surface that is disposed radially inward of a radially outer end face that faces the inner peripheral surface of the stator core in the magnetic pole head in the radial direction and gradually inclines radially inward toward the axially outer side. ,
A rotating electrical machine comprising: a step that connects an axially outer end of the radially outer end surface and an axially inner end of the inclined surface in the radial direction. A cylindrical stator core,
A plurality of protrusions that are rotatably supported on the inner side in the radial direction of the stator core and protrude toward the outer side in the radial direction are arranged along the circumferential direction;
A field winding wound around the side surface of the protrusion;
A magnetic pole head that is provided on the top surface of the projecting portion and contacts the outer end surface in the winding direction of the field winding to hold down the field winding;
Provided with both ends of the magnetic pole head in the axial direction together with the magnetic head of the magnetic pole, and a pressing portion for pressing the coil end in contact with the outer end surface in the winding axis direction at the coil end of the field winding. ,
The pressing portion is
Arranged axially inside from both axial end surfaces of the stator core,
An inclined surface that is disposed radially inward of a radially outer end face that faces the inner peripheral surface of the stator core in the magnetic pole head in the radial direction and gradually inclines radially inward toward the axially outer side. ,
A rotating electrical machine comprising: a step that connects an axially outer end of the radially outer end surface and an axially inner end of the inclined surface in the radial direction. In the rotating electrical machine according to claim 1 or 2,
The rotating electric machine, wherein the protrusion and the magnetic pole head are separate members. In the rotary electric machine according to any one of claims 1 to 3,
The step is formed in the entire width direction of the pressing portion.

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